The EF 40mm f/2.8 STM offers an ultra-slim and lightweight design. This lens also includes an aspherical element, a bright 2.8 aperture, and optimized coatings that minimize ghosting and flare while providing exceptional color balance.

Below are the specifications of the EF 40mm f/2.8 STM lens from Canon.

Despite it’s mostly plastic construction and affordable price, the Canon EF 40mm f/2.8 STM build quality is reassuringly good, certainly better than some of Canon’s 50mm primes. It’s a great match for either a full-frame Canon DSLR like the EOS 6D or an APS-C body like the EOS 700D that we tested it with, where the focal length changes to 64mm.